Set-works gripping device.



L. D. HANFORD.

SET WORKS GRIPPING DEVICE.

APPUcATloN HLED Nov. 25. i912.

l 1 89,563 Patented July 4, 1916.

AT1-GRN EY tinirnn srnrns ramena crimen.

LEMUEL D. IIANFORD, OF MILWAUKEE, WISCONSIN, ASSIGNOR, BY MESNE ASSIGN-MENTS, TO ALLIS-CIIALMERS MANUFACTURING COMPANY, A CORPORATION OFDELAWARE.

SET-WORKS GRIPPING DEVICE.

Speccaton of Letters Patent.

' Patentes .nay a, isis.

Application led November 25, 1912. Serial No. 733,564. i

To all 'whom it may concern Be it known that I, LnMUiiL D. HANFORD, acitizen of the United States, residing at Milwaukee, in the county ofMilwaukee and State of lVisconsin, have invented a certain new anduseful Improvement in Set-Works Gripping Devices, of which the followingis a specification.

This invention relates to improvements in the construction of set-worksfor sawmills, and particularly to gripping devices adapted for use inthat class of set-works in which the settingl is performed by handpower.

An object of the invention is to provide a gripping device forhand-power setworks which is simple in construction and eihcient inoperation.

` Another object is to provide a mechanismV which is more durable andaccurate in its operation than similar devices of the prior art havebeen.

These results are accomplished generally in the device of the presentinvention by improving and strengthening the various elements so thatthe possibility of excessive wear with its resulting lost motion, ispractically eliminated.

Still another object of the invention is to provide a device in whichthe parts which are subject to greatest wear are accessible and readilyremovable.

A clear conception of an embodiment of the invention may be had byreferring to the drawing accompanying and vforming part of thisspecification in whichflike reference characters designate the same orsimilar parts in the various views.

Figure l is a side elevation of a handpower set-works, showing fragmentsof the operating lever and carriage. Fig. 2 is a transverse verticalsection through the set shaft, carrier arm, grip-block and gripblockcap. Fig. 3 is a vertical section through the carrier arms, grip-blocks,springs and grip-block caps, the section being taken on the line II--IIof Fig. 2 looking in the direction of the arrow.

The set-works as disclosed, shows the various operating elements inmid-position. The frame 23 is mounted on the carriage 31 in the usualmanner and has bearings 80, 32, formed therein. The rock shaft 22 issupported in the bearings 32 and has the usual crank disks 21V andoperating lever 18 se cured thereto. rihe set shaft l is supported torotate in the bearings 30 of the frame 23, and has a ratchet wheel 5mounted thereon and securedthereto by any suitable means, such as keys34. A pair of carrier arms 2, 4, are 'supported by the set-shaft l, oneon each side of the ratchet wheel 5. The carrier arms 2l, 4:, are freeto oscillate on the shaft l, being removable from the shaft l uponremoval of the retaining caps 16, 17, which are`secured to the arms 2,4, respectively, by means of bolts 6. The free eX- tremities of thecarrier arms 2, t, are provided with gripblock supports 36, 37, whichare preferably formed integral with ythe body portions of the arms 2, 4.yThe gripblock supports 36, 37, extend over the face of the ratchetwheel 5 and have parallelsided, radially directed openings formedtherethrough.

The grip-blocks 11, which in the present disclosure number two to eachcarrier arm 2, 4, have parallel sides which closely fit the sides of theradially directed openings.

formed through the supports 36, 87. The teeth of the grip-blocks l1 aresimilar in contour to those of the ratchet wheel 5. The openings in thesupports 36, 37, are so located that with the teeth of one of the blocks11 in full coaction with the teeth of the ratchet wheel 5, the teeth ofthe other block will be in contact with the adjacent teeth of theratchet wheel 5 along the inclined surfaces but not along the radialsurfaces thereof, see Fig. 2. The object of this construction is to-prevent excessive return motion or slip of the ratchet wheel 5 duringwithdrawal of one of the grip-blocks 11 from operating position andapplication'of another block 1l to operative position.

The grip-blocks l1 are provided with stems 8 which extend away from theblocks in a direction radial to the set-shaft l, and pass through theremovable grip-block caps 12. The helical compression springs 13surround the stems 8 and coact with their outer ends against the caps l2and with their inner ends against the grip-blocks 11. These springs 13tend at all times to force the grip-blocks 11 radially toward the setshaft l and wheel 5. Removable transverse lifting pins 14; pass throughthe outer ends of the stems 8, some distance above the caps l2. rIheforked grip releasing arms 7 are pivotally mounted on removable pivotpins 33, and have forked ends the prongs of which eXtend under theprojecting ends of the liftingpins` 14. The corresponding inwardlyprojecting ends ofthe arms 7 extend to a position in proximity withtheireleasing cams 10. The cams 10, of which there is one for eachi setof grip-blocks 11, are.

secured to stub shafts 15 which are rotatably mounted in bearings thecarrier arms 2, 4. The releasing` levers 9 have their inner ends securedto the shafts 15A, while their outervcorresponding" ends are directedtoward each other to substantially span the gap between the .carrierarmslfZ; 4.

The' carrier arm 41 is connected with the crank disk 2f by means of aconnecting' rod 19.` the end of which is removably connected with' thearm' 4 by a bolt' 24'. The carrier arm '2f isconnected' with'. the crankdisk 21' by means' of a connectingro'd 20' the end of which isremovably.' connected with the arm Q'by` a bolt 3.

During settingl operation of the mechanism, the operating; lever 18 iso'scillated about thea rock shaft 22 causing the crank disks 2,1 tooscillate with a resulting'reciprooation of the' connectingV rods,1f9;520;y As

' the pin 24"` ismoved.v forward by the connect'- ing rod 19; thecarrier' arm 4( and its corresponding grip-blocks 11 are oscillatingabout' the set' shaft' 1 in an anti-clockwise direct'ion, and areVeife'ctive in rotating the ratchet wheel 5. Duringthe forward move-`ment ofthe connecting rodK 19, the rod 20'is beingwithdrawn withl aresulting` movement of the carrier arm 2" and itsl grip-blocks 1`1` inaY clockwise or ineffective direction. Upon reversal of: the movement'of the operating lever18, the reverse movement ofthe carrier arms 2,4,.,takes place, and the grip-blocks 11 ofl the carrier arm 2'becomeeif'ective in moving the. set shaft lwhile those of' the carrierarm 4 become meifective and recede in a clockwise direction around theperiphery ofl the wheel 5. It will thus be seen that the intermittentoscillatory movement of the operating. lever 1'8'is transformed int'ocontinuous rotary movement of the set shaft 1.

During recession of the knees on" the set works andL while a fresh logis being plac'ed', it isdesirab'le to .havev theA set shaft 1, free torotate without restraint in` a clockwise direction. Inr order' to sorelease the set shaft 1*, the ratchetwheel must be released; bywithdr'awal of' the grip-blocks 11 therefrom. This removal" of thegrip-blocks is preferably effected by bringingthe 'operating lever 18 tomid-position and"y their simultaneously *swinging the two releasinglevers 9' so that the releasingY cams' 1'0 take a substantiallylongitudinal rather than a vertical position asl shown. This change inposition ofthe cams'l'O causes pressure against the inwardly projectinglends -of' the' releasing arms 7. This pressure` separates the ends ofthe arms 7 and. forces the forked ends of the arms 7 outwardly andt awayfromvr the ratchet wheel 5. The outwardly moving forkedv ends of thearms 7 eventually comein contact, with the: ends ofthe transverse pins14 andy lift the stems 8 and grip-blocks 11 away from the ratchetv wheel5 against the pressure of the springs 13. The release of all of thegrip-blbcks 11 needtnot be effected simulv taneously ifnot so desired.When thev knees have been brought totheir proper positions, the levers9" are returned to.. setting position, immediately followingwhich thegripblocks' 11 become effective and:` positively.

lock the set shaft against further' motion in' a clockwisel direction.If' it i's desired to remove the grip-blocks 11 for inspection, it isnecessary only to; re-

move the caps landp'ins 33', whereuponthe blocks 1'1 may be readilywithdrawn from their sockets. l VThe formation of each indi"- vid'ualgrip-bleek l1 with a number of' grippingtee'th,w provides a largergripping area and reduces the danger Ofbreaking of the gripping means.The use ofgrip-blbcks 11 having plane surfaces of reaction in thecarrier arms 2", 4, also' eliminates the eXcessive wear heretoforeencountered' with the use ofYA pivotal supports for the pawls; therebyproviding a more accurate setting device. By forming the supports 36,37., integral with the carrier'. arms 2, 4, a more rigid support ofthegrip-blocks 11 is obtained, than by suspending the pawls from overhungpins. It will alsolbe observed that-all' ofthe working partsofthe devicearereadily ac'- cessible for lubrication andi repairs in eases ofemergency.y p

It should be understood that it is' not desired to be limited to theexact details of construction shown and described, for' obvious,modiiications will occur toa person skilled' in the' art.

Itis claimedand' desiredto secure by Letters P'at'ent,- Y v 1. Incombination, a set-shaft, a ratchet wheel secured thereto, a carrier armhaving an opening therethrough, a cap secured; to

said` carrier ,arm` adjacent the opening therein, .a grip-block movablewithin. said opening and havingja projection formedI with an abutment;and an armen'gageable with said abutment'` for' moving said gripJ-b'lockaway from said ratchet wheel and' for retaining tion of said block,whereby said gripblock is retained within' the recess of said carrierarm at all times.

In` testimony whereof, thesignature of the inventor is axed hereto inthe presence of 15 two witnesses.

LEMUEL D. HANFORD.

through said opening upon removal of said cap.

3. ln combination, .a carrier arm having a recess therein, a grip-blockslidable within said recess and formed with abutments, a cap, and anarm, said cap being engageable with an abutment of said grip-block tolimit outward motion of said block and said arm Witnesses: being!`engageable with another of said abut- G. F. DE WEIN, ments of saidgrip-block to limit inward mo- W. H. LIEBER.

@oplos of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

